Speaker
Description
Precision measurements of Standard Model parameters are essential to overconstrain the theory and search for signatures of new physics. These parameters also serve as critical inputs for a wide range of precision physics analyses. In particular, the electroweak couplings of quarks provide valuable insights into the SM gauge structure and enable stringent tests of flavour universality.
In this contribution, we present a prospective study on constraining quark electroweak couplings at future $e^+e^-$ colliders. We discuss how combining measurements across different centre-of-mass energies, both with and without beam polarisation, allows one to disentangle the left- and right-handed coupling components and substantially improve precision beyond the LEP legacy.